<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>下拉列表</title>
</head>
<body>
    城市
    <select>
        <option>上海</option>
        <option>北京</option>
        <option>南京</option>
    </select>
</body>
</html>